Which feature improves the safety of a home automation system?

Strong, unique passwords for different devices significantly enhance the security of a home automation system. This practice helps to prevent unauthorized access and potential breaches that can occur when multiple devices share the same password or if weak passwords are used. Each device connected to the home automation system often has its own vulnerabilities, and using unique passwords minimizes the risk of an attacker gaining access to multiple devices simply by cracking one weak password.

Additionally, unique passwords ensure that if one device is compromised, the attacker cannot freely access all other devices on the network. By employing complex, varied passwords for each device, homeowners can better safeguard their personal information, privacy, and control over their smart home systems.

In contrast, the other options do not contribute to enhancing safety effectively. Shared passwords can create easy avenues for unauthorized access, public Wi-Fi exposes devices to stronger security threats, and routine factory resets may temporarily clear settings and passwords, but such measures do not build a foundational layer of security like strong, unique passwords do.